AUIR3241S AUIR3242S - Board Back to Back 12V用户指南说明

AUIR3241S/AUIR3242S - Board Back to Back 12V User Guide
About this document
Scope and purpose
H elp customers to “plug and play” AUIR3241S/AUIR3242S back-to-back board in order to assess the features of the underlying product AUIR3241S/AUIR3242S.
For sake of simplicity this document is valid for both AUIR3241S back-to-back board and AUIR3242S back-to-back board.
Difference between AUIR3241S and AUIR3242 is Vin pin logic:
AUIR3242S ON → Vin= low
AUIR3241S ON → Vin= high
Table of contents
About this document (1)
Table of contents (1)
1Overview (2)
2Connecting and operating the board (3)
3Switching behaviour (4)
4Mechanicals (5)
5Electrical schematic (6)
5.1Electrical diagram (6)
5.2Bill of materials (7)
6PCB details (8)
Revision history (9)
Overview
1Overview
AUIR3241S/AUIR3242S board back-to-back is a semiconductor-based solution of a fail-safe/fail operational power switch for automotive applications.
AUIR3241S/AUIR3242S board has a back-to-back, N-channel MOSFET common source structure and allows replacement of any mechanical relay by cutting the current flow in both directions. Additionally, the back-to-back structure blocks current in case of reverse battery situation.
The MOSFET are protected against linear mode by UVLO (Under voltage lock-out) feature, integrated in the driver. See driver datasheet for more information on the feature.
An analog and digital circuit a re implemented to monitor driver’s boost converter activity and detect gate-source leakage of MOSFET.
Connecting and operating the board
2 Connecting and operating the board
This chapter describes how to connect the board and gives a non-exhaustive list of actions to avoid in order to keep AUIR3241S/AUIR3242S and the board operational.
The board is designed for 50A continuous, 80A for one-minute operation. Note: It is important to always connect TP5 GND to the battery or power supply negative/ground
terminal.
Important tips:
• Connect both power connectors (P5&P6, P2&P5) if using continuous currents >10A. • Do not connect P1 and P2 jumper at the same time. Start by connecting P1, analog diag.
P1
P2P3P4
P5
P6
Please Avoid the following:
- Short between Cout and GND as this will lead to driver destruction —Short Vout to Vcc to try UVLO
feature.
- Do not connect two batteries/power sources together as there is no protection implemented.
Switching behaviour
3Switching behaviour
Note: Values shown in this chapter are measured under lab conditions and will vary for different cooling conditions and setups, and samples used.
Waveforms from OFF to ON mode [Yellow V IN; Green V RS; Blue V GS(AUIR3241S); Purple V
Figure 4 shows the behavior of the RS pin and analog diagnostic during turn-on, assuming that a short-circuit is present across gate- source of one of the MOSFET. This can be tested by replacing one of the diodes (D5, D6, D7, D8) across a MOSFET gate-source by an appropriate SMD resistor.
Waveforms from OFF to ON mode with R GS(SHORT)=100Ω [Yellow V I N; Green V RS; Blue V
Mechanicals
4Mechanicals
5Electrical schematic
5.1Electrical diagram
Figure 6Driver side, valid for both AUIR3241S and AUIR3242S
5.2Bill of materials Table 2Bill of material
PCB details
6PCB details
AUIR3241S/AUIR3242S PCB is a 2-layer, FR4 material board. Figure 8 describes the layer arrangements; layer details can be found in figure 9.
Vias were used to connect the two layers on the power side to allow better thermal flow and current sharing between layers. However, the number of vias is not optimized and can be reduced without reducing the board thermal performance.
The layout choice offers many MOSFET test possibilities: back-to-back, Q-diode, one MOSFET + 3 Q-diodes or high-side switch MOSFET.
Figure 9Top layer (left) and bottom layer (right) [105µm]
AUIR3241S - Board Back to Back 12V User Guide
Revision history
Revision history
Published by Infineon Technologies AG 81726 Munich, Germany © 2020 Infineon Technologies AG. All Rights Reserved.
Do you have a question about this document?
Email: ********************
Document reference IMPORTANT NOTICE
The information given in this document shall in no event be regarded as a guarantee of conditions or charactercharacteristics (enheitsgarantie”).
With respect to any examples, hints or any typical values stated herein and/or any information regarding the application of the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party.
In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customer’s products and any use of the product of Infineon Technologies in customer’s applications.
The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of customer’s technical departments to evaluate the suitability of the product for the
For further information on the product, technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies office ( ).
WARNINGS
Due to technical requirements products may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies office.
Except as otherwise explicitly approved by Infineon Technologies in a written document signed by authorized representatives of Infineon Technologies, Infineon Technologies’ products may not be used in any applications where a failure of the product or any consequences of the use thereof can reasonably be expected to result in personal injury.
Edition 2020-09-09
ifx1
Trademarks All referenced product or service names and trademarks are the property of their respective owners.。